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T8형 LED 조명장치 구동을 위한 정전압 정전류 출력전원장치 개발에 대한 연구
구춘근(Choon-Keun Koo),서대석(Dae-Seok Seo) 산업기술교육훈련학회 2014 산업기술연구논문지 (JITR) Vol.19 No.4
This Study focused on the development of Power supply equipment to supply the stabilized electric power over load conditions change. In this paper, the circuit of proposed SMPS designed for purposed to output the high quality of constant voltage and current. The proposed circuit with LNK 409 keep up the 95% of power factor and efficiency in spite of the load change. To improvement the above weak point, the developed SMPS unit monitored the voltage and current over 2 nd side of transformer for purposed to supply constant voltage and current additionally. The Experimental tests was applied the LED lighting of 46W.
문영재,구춘근,정찬수,곽희로 한국조명전기설비학회 1993 조명.전기설비 Vol.7 No.6
전력 수요가 증가함에 따라 전력용 변압기의 용량이 커지고, 따라서 변압기사고의 파급효과가 커지게 된다. 본 논문은 전력용 변압기의 절연 열화에 의한 사고를 예방진단하기 위한 부분방전의 초음파 측정 기술을 응용하여, 초음파-초음파 측정법에 대한 부분방전점의 위치검출법을 연구하였다. 정확도를 높이기 위해 상호상관함수를 이용할 것을 제안하였으며 모의변압기에서 실험한 결과 만족할 만한 결과를 얻었다. This paper describes an effort to develop a microcomputer-based parameter identification system for three phase and two phase brushless DC motor. Back EMF equation is derived from back EMF waveform of three phase and two phase brushless DC motor. In this paper, a new identification algorithm for the brushless DC motor parameters by Pasek's technique is de veloped. It is found that Pasek's equation is valid for the brushless DC motor, too. The results obtained clearly shows that it is possible to implement the identification system for the determination of the brushless DC motor parameters. To minimize errors due to the ripple component in the measured armature current, dlgital averaging filter is employed. The whole identification process of signal generation, measuring, parameter determination is fully automated. The use of the pmpased method in the parameter identification system shows that the averaged current curve is in excellent agreement with the estimated current curve. Therefore, this close agreement conf i i the validity of this technique.